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BREAKING THE RUSSIAN ICE

Gives some data on dusting, mentions the bubbler system for melting or preventing formation of ice in inland waters and announces the development of two ice-cutters in the USSR. One is for rivers, reservoirs and canals with ice thickness not greater than 0.5 m. The other is for unbroken ice up to 2 m thick. The principle involves making longitudinal cuts by mechanical or hydraulic means before the ice is actually broken up.